Unable to restore dynamic disk - help !

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I backed up a dynamic disk to my NAS. Now I am trying to restore it.

1) when I use the Windows 10 GUI, it took about 15 minutes before it would let me select the partition for restore, then asked for a restart.

But the system just restarts to Windows, not Acronis. No restore actually happens.

I went to fiddle in the BIOS and saw that there was an "Acronis loader" option available in the boot options. So, I manually set it.

It then booted to Acronis - I think the Linux version, not sure - but it immediately failed. I saved the logs and looked at them. The only thing I could make up from them was with "file not found". This may be because Acronis TI 2019 doesn't have drivers for my NIC (Aquantia AQN-107).

2) I used the MVP forum tool to create custom boot media and added the Aquantia drivers and the map.cmd for my NAS.

It failed to mount the drive.

I ran into errors 1312 and 58.

After many google searches, I found I have to use the /user:domain\user syntax to get it to work.

But I also had to map it to B: . Nothing else worked - all the other drive letters I tried (T:, U: V:, X:, Z:) were available.

Something is seriously messed up with the boot media.

After I got into the Acronis GUI, I pointed to the backup on my B: drive. It took a very long time to read it. I had dinner. Finally could select the dynamic disk to restore.

Then, when it came time to select a restore partition, Acronis showed a me a list with all the choices greyed out (no available choice).

The original dynamic disk was 5 TB (5 x 1 TB SSD striped). The new dynamic disk is 8 TB (8 x 1 TB SSD striped). Acronis should have let me select the new dynamic disk partition for restore. But it didn't ! It was in the list, just marked as not available for restore.

So, how the hell am I supposed to restore the data ?

The only thing I can think of I haven't tried is file-based restore, but that's going to take ages.

Edit: file restore does work, but it's ultra-slow. task manager showing only about 300 Mbps of throughput. At this rate it will take over 24 hours to restore the 3.5 TB data.

The NIC is 10 Gpbs and the NAS can handle the full rate, as can the local disk I'm restoring to, so a partition-based restore rather than file-based restore should take about 1 hour, 2 hours max, if it weren't for Acronis' inability to restore the dynamic disk partition.

 

Thu, 11/12/2020 - 06:51
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mvp

Julien, you are doing something here that I have no direct experience of dealing with in terms of recovering to your 8TB dynamic disk array.

The first issue with using any Acronis rescue media is that the destination drive to be used for recovery must be visible and recognised as if it is a single disk drive, i.e. not seen as the component 8 x 1TB SSD drives, which I assume has been handled if you have been able to do file restores from the NAS backup.

Next, still considering the destination 'drive' then this also needs to be recognised as either being uninitialised or else as having the same partition scheme as the boot mode used by the rescue media, i.e. GPT for UEFI boot or MBR for Legacy boot.  If the drive is seen as being unitialised then the Tools > Add new disk feature can be used to prepare the drive with the correct partition scheme ready for being made available for recovery operations.

Satisfying the above requirements should normally allow the destination drive be selected for recovery, especially when dealing with a larger drive than the one originally backed up.  I find it best to leave the destination disk as unallocated disk space when doing a disk recovery, to let ATI recreate the partition structure from the backup image file being used for recovery.

In terms of performance of recovery then if it is possible to connect your PC direct to the NAS via USB, that should be significantly faster than connecting across a network plus avoids the issues with network credentials & mapping etc.

Thu, 11/12/2020 - 10:54
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truwrikodrorowrelupicugojestutroclulachosaswunuhospikigawakijosaswenomaruclojeueclikaspedrubewidebrisubrohutrurifruuagothunugekedrumucisiuobrobrecrupeslapuswosluprothethibakaslechurathikucli
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Hi Steve,

I wish I could quote you inline, but I can't figure out how. I can only quote the entire block and not respond inline.

1. The file restore that succeeded was when booting Windows from the main SSD, which is a on a separate NVMe drive. I wasn't using the Acronis boot media in that case. It ended up taking 7 hours for 3.5 TB, which is about 1.1 Gbps, faster than the 300 Mbps I was seeing in task manager originally when restore started.

2. when using the boot media created with MVP, the Windows command prompt could see the 8x1TB array as a single drive letter. But the partition restore in Acronis failed. Acronis did see the 8TB dynamic disk partition. It just wouldn't let me select it for restore. It wasn't seen as being uninitialized. I'm not sure if it has anything to do with the mismatched size between the backup, which was 5 TB (original 5 x 1TB array), and the restored volume, which is 8 TB ( 8 x 1 TB).

3. re: USB, that's not an option for connecting my NAS, but I should note that it would be slower than the network I'm using . I use a 10 Gbps network. USB 2.0 maxes out at 480 Mbps, and USB 3.0 at 5 Gbps. USB 3.1 Gen2 would support 10 Gbps. Either way, no USB connection would be faster than the network connection I'm using, at best equal with USB 3.1 Gen2.

I guess I'm OK for today as all my data has been restored successfully using file restore. But I still want to be able to do a partition restore in the future and not just the much slower file restore.

 

Thu, 11/12/2020 - 20:30